One-pot Synthesis Of Poly(3-hexylthiophene)-b-poly(quinoxaline-2,3-diyl) Amphiphilic Diblock Copolymer And The Research Of Its Properties

This paper introduced the synthesis of the block copolymer poly(3-hexylt-hiophene)-b-poly(quinoxaline-2,3-diyl) in one pot via sequential monomer additionwith Ni(II) complex as a single catalyst, under GRIM mechanism. The blockcopolymerization was proved to proceeded in a living/controlled chain-extensionmanner, afforded well-defined copolymers with controlled molecular weights, narrowmolecular weight distributions, generally between1.1to1.5. By NMR, IR and UVdetection, the structure of the copolymer is confirmed.Two kinds of cyclic structure, lipophilic poly(3-hexylthiophene) and hydrophilicpoly(quinoxaline-2,3-diyl), make up the rigid backbone. This special structure makes itpossible to self-assemble in a mixed solution of chloroform and methanol. Changingthe composition of solvent, the polymer solution can gradually change color fromyellow to purple. At the same time, fluorescence covers a wide range of wavelength,from bright yellow to deep blue. Observed by transmission electron microscopy andatomic force microscopy, self-assembled morphology is spherical nanoparticles.After the tetrahydrofuran solution of the diblock polymer, the Co2+ion was addedand the solution changed color. In the light of365nm wavelength, the light emittedfades to yellow-orange from the initial light green. Further experiments showed that thepolymer solution on the Co2+ions is highly selective.